LS vs SS

Very happy with my Splitting Steel Trickster.
But i could upgrade it with Fortify on Melee hit by switching to Lightning Strike.

In PoB i gain ~15% more Damage and a bit more range, which feels nice in maps.
But then i checked PoE Ninja just to find out that only 0,2% of Tricksters use LS.
Why is that?

My level 100 splitting steel trickster has 16k ES, clears well, does T17s easily. Why would I need fortify?

I dont need it.
I want it.

OK. I'm sure there is a jewel, passive tree node, gear mod or enchantment somewhere that will add fortify to SS. Some smart character builder might find the answer. :)